The 85-year-old Kelly is one of the few artists surviving from the great age of American abstract art that gave the world abstract expressionism, colour field, minimalism and hard-edge painting. While remaining true to the formal rigour of abstraction, Kelly's work has always retained an air of romanticism. As he says, "I think that if you can turn off the mind and look at things only with your eyes, ultimately everything becomes abstract." Yet, Kelly never turns off his heart. His exquisitely weighted compositions, no matter how non-representational, echo natural forms. And in this, a small but choice selection of his lithographs, the natural references are more overt than usual. Influenced by his formative years in Paris (shades of Matisse) and by a wartime duty with the 603rd Engineers Camouflage Battalion, he concentrates the plant-like forms into essences of lyrical grace.
• Ingleby Gallery, to 31 Jan